A new female colleague came to the Detective Department, who turned out to be Yang Muci's junior sister. The purpose of Hanshuang coming to Shanghai was for the Thunder Project. She planned to get close to Yang Muchu, but fell in love with Yang Muci. Yu Mingliang from the Shanghai Chamber of Commerce also fell in love with Li Hanshuang. The grievances of the world, the love and hatred of children, were nothing compared to the Japanese invasion. The Anti-Japanese War started. Li Hanshuang, Yang Muci, and Yu Mingliang all threw themselves into the anti-Japanese tide.